Its great for a nano, but it can become a pain for larger tanks hauling all that water around. I switched to making my own recently when I got a 150 galI find it makes life easier for me anyway to buy premixed salt from a LFS, pet connection sells it $1 a gallon at whatever salinity you want, they are on a rodi unit so it's not tap water and it's just easier lol, take a 5gal drum there every other thursday and use the whole 5 for my 29 biocube, done! Lol
+1. I have heard some say that you should slowly mix your new salt in with the old, increasing the percentage of new and decreasing the percentage of old over time, but I have never had a problem swithching salts "cold turkey" when doing normal 10% water changes. Even with all the new water being a different salt, the water in the aquarium is still mixed with 90% old salt.I just phase in as normal waterchanges.